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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/rendering/PaintInvalidationState.h"
#include "core/rendering/RenderInline.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/svg/RenderSVGModelObject.h"
#include "core/rendering/svg/RenderSVGRoot.h"
#include "platform/Partitions.h"
namespace blink {
PaintInvalidationState::PaintInvalidationState(const RenderView& renderView)
: m_clipped(false)
, m_cachedOffsetsEnabled(true)
, m_forceCheckForPaintInvalidation(false)
, m_paintInvalidationContainer(*renderView.containerForPaintInvalidation())
{
bool establishesPaintInvalidationContainer = renderView == m_paintInvalidationContainer;
if (!establishesPaintInvalidationContainer) {
if (!renderView.supportsPaintInvalidationStateCachedOffsets()) {
m_cachedOffsetsEnabled = false;
return;
}
FloatPoint point = renderView.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(point.x(), point.y());
}
m_clipRect = renderView.viewRect();
m_clipRect.move(m_paintOffset);
m_clipped = true;
}
PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, RenderLayerModelObject& renderer, const RenderLayerModelObject& paintInvalidationContainer)
: m_clipped(false)
, m_cachedOffsetsEnabled(true)
, m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation)
, m_paintInvalidationContainer(paintInvalidationContainer)
{
// FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
bool establishesPaintInvalidationContainer = renderer == m_paintInvalidationContainer;
bool fixed = renderer.style()->position() == FixedPosition;
if (!renderer.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled)
m_cachedOffsetsEnabled = false;
if (establishesPaintInvalidationContainer) {
// When we hit a new paint invalidation container, we don't need to
// continue forcing a check for paint invalidation because movement
// from our parents will just move the whole invalidation container.
m_forceCheckForPaintInvalidation = false;
} else {
if (m_cachedOffsetsEnabled) {
if (fixed) {
FloatPoint fixedOffset = renderer.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y());
} else {
LayoutSize offset = renderer.isBox() && !renderer.isTableRow() ? toRenderBox(renderer).locationOffset() : LayoutSize();
m_paintOffset = next.m_paintOffset + offset;
}
if (renderer.isOutOfFlowPositioned() && !fixed) {
if (RenderObject* container = renderer.container()) {
if (container->style()->hasInFlowPosition() && container->isRenderInline())
m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(toRenderBox(renderer));
}
}
if (renderer.style()->hasInFlowPosition() && renderer.hasLayer())
m_paintOffset += renderer.layer()->offsetForInFlowPosition();
}
m_clipped = !fixed && next.m_clipped;
if (m_clipped)
m_clipRect = next.m_clipRect;
}
if (m_cachedOffsetsEnabled && renderer.isSVGRoot()) {
const RenderSVGRoot& svgRoot = toRenderSVGRoot(renderer);
m_svgTransform = adoptPtr(new AffineTransform(svgRoot.localToBorderBoxTransform()));
if (svgRoot.shouldApplyViewportClip())
addClipRectRelativeToPaintOffset(LayoutSize(svgRoot.pixelSnappedSize()));
}
applyClipIfNeeded(renderer);
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, const RenderSVGModelObject& renderer)
: m_clipped(next.m_clipped)
, m_cachedOffsetsEnabled(next.m_cachedOffsetsEnabled)
, m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation)
, m_clipRect(next.m_clipRect)
, m_paintOffset(next.m_paintOffset)
, m_paintInvalidationContainer(next.m_paintInvalidationContainer)
{
ASSERT(renderer != m_paintInvalidationContainer);
if (m_cachedOffsetsEnabled)
m_svgTransform = adoptPtr(new AffineTransform(next.svgTransform() * renderer.localToParentTransform()));
}
void PaintInvalidationState::addClipRectRelativeToPaintOffset(const LayoutSize& clipSize)
{
LayoutRect clipRect(toPoint(m_paintOffset), clipSize);
if (m_clipped) {
m_clipRect.intersect(clipRect);
} else {
m_clipRect = clipRect;
m_clipped = true;
}
}
void PaintInvalidationState::applyClipIfNeeded(const RenderObject& renderer)
{
if (!renderer.hasOverflowClip())
return;
const RenderBox& box = toRenderBox(renderer);
// Do not clip scroll layer contents because the compositor expects the whole layer
// to be always invalidated in-time.
if (box.usesCompositedScrolling())
ASSERT(!m_clipped); // The box should establish paint invalidation container, so no m_clipped inherited.
else
addClipRectRelativeToPaintOffset(LayoutSize(box.layer()->size()));
m_paintOffset -= box.scrolledContentOffset();
}
} // namespace blink
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